Publications
269 results found
De Carvalho NV, Pinho ST, Robinson P, 2011, An experimental study of failure initiation and propagation in 2D woven composites under compression, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 71, Pages: 1316-1325, ISSN: 0266-3538
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- Citations: 64
Gutkin R, Laffan ML, Pinho ST, et al., 2011, Modelling the R-curve effect and its specimen-dependence, INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, Vol: 48, Pages: 1767-1777, ISSN: 0020-7683
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- Citations: 67
Vyas GM, Pinho ST, Robinson P, 2011, Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 71, Pages: 1068-1074, ISSN: 0266-3538
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- Citations: 63
De Carvalho NV, Pinho ST, Robinson P, 2011, Reducing the domain in the mechanical analysis of periodic structures, with application to woven composites, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 71, Pages: 969-979, ISSN: 0266-3538
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- Citations: 42
Gutkin R, Green CJ, Vangrattanachai S, et al., 2011, On acoustic emission for failure investigation in CFRP: Pattern recognition and peak frequency analyses, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 25, Pages: 1393-1407, ISSN: 0888-3270
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- Citations: 386
Carvalho NVD, Pinho ST, Robinson P, 2011, A mathematical framework for reducing the domain in the mechanical analysis of periodic structures, Publisher: arXiv
A theoretical framework is developped leading to a sound derivation ofPeriodic Boundary Conditions (PBCs) for the analysis of domains smaller thenthe Unit Cells (UCs), named reduced Unit Cells (rUCs), by exploitingnon-orthogonal translations and symmetries. A particular type of UCs,Offset-reduced Unit Cells (OrUCs) are highlighted. These enable the reductionof the analysis domain of the traditionally defined UCs without any loadingrestriction. The relevance of the framework and its application to any periodicstructure is illustrated through two practical examples: 3D woven andhoneycomb.
Pimenta S, Pinho ST, 2011, Recycling carbon fibre reinforced polymers for structural applications: Technology review and market outlook, WASTE MANAGEMENT, Vol: 31, Pages: 378-392, ISSN: 0956-053X
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- Citations: 529
Kiefer K, Robinson P, Pinho ST, 2011, Comparison of models for the simulation of fatigue-driven delamination using cohesive elements
In this pape,r two formulations for introducing fatigue damage into cohesive elements have been examined to determine their mesh sensitivity and numerical stability in mode I. A simple, non-FE model has been used to quickly assess a wide range of parameters associated with the fatigue degradation routines developed for cohesive elements. The model has been used to explore the sensitivity of two fatigue degradation strategies to changes in key parameters. For small element and cycle increments, both models predict the fatigue crack growth rate accurately for various applied loads where the Paris law is valid. However the models exhibit significant mesh sensitivities. The analysis has shown that in order to obtain a numerically stable algorithm, the models need to be improved.
Stocchi C, Robinson P, Pinho ST, 2011, A detailed finite element investigation of composite bolted joints with countersunk fasteners
This paper presents a very detailed FEM model of a single lap shear composite bolted joint, with countersunk fasteners, under static tensile load. Parametric studies have been performed to study the influence of clamping force, coefficient of friction and clearance on the joint behaviour. It has been found that the model is able to identify correctly the joint critical locations and that the joint behaviour can be divided in five stages, which are deeply influenced by the three studied parameters.
Teixeira RF, Pinho ST, Robinson P, 2011, Translaminar ply fracture toughness of advanced composites
The translaminar fracture toughness of fibre reinforced polymers (FRP) is important to characterise the failure resistance and response of notched composite structures. Compact Tension (CT) tests of UD 90° [(90 6/0)2/903]s, [(90/0) 8/90]s and [(906/-45/906/+45)/ 903]s laminates were conducted in order to investigate the crack development and measure the translaminar fracture toughnesses values for three plies of interest:90°,0° and ± 45° A quasi-isotropic layup with 90°,0° and ±45°plies was also investigated. Testing was monitored with digital image correlation (DIC). The test method and data reduction scheme are the result of extensive background work [1]. Failure sequence was analysed using optical micrography, SEM, C-Scan and X-ray.
Pimenta S, Pinho ST, Robinson P, et al., 2010, Mechanical analysis and toughening mechanisms of a multiphase recycled CFRP, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 1713-1725, ISSN: 0266-3538
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- Citations: 38
Gutkin R, Pinho ST, Robinson P, et al., 2010, Micro-mechanical modelling of shear-driven fibre compressive failure and of fibre kinking for failure envelope generation in CFRP laminates, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 1214-1222, ISSN: 0266-3538
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- Citations: 71
Gutkin R, Pinho ST, Robinson P, et al., 2010, On the transition from shear-driven fibre compressive failure to fibre kinking in notched CFRP laminates under longitudinal compression, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 1223-1231, ISSN: 0266-3538
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- Citations: 99
Laffan MJ, Pinho ST, Robinson P, et al., 2010, Measurement of the in situ ply fracture toughness associated with mode I fibre tensile failure in FRP. Part I: Data reduction, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 606-613, ISSN: 0266-3538
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- Citations: 100
Laffan MJ, Pinho ST, Robinson P, et al., 2010, Measurement of the in situ ply fracture toughness associated with mode I fibre tensile failure in FRP. Part II: Size and lay-up effects, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 614-621, ISSN: 0266-3538
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- Citations: 83
Carvalho NV, Pinho ST, Robinson P, 2009, Compressive failure of 2D woven composites
This paper presents experimental and numerical research on the compressive failure of orthogonal 2-D woven composites with different stacking emphasizing the role of the interlacing region of tows. Resulting optical micrographs demonstrate the influence of the support of adjacent layers on the sequence of events leading to failure of woven composites.
Laffan MJ, Pinho ST, Robinson P, et al., 2009, Fracture toughness measurement for mode i fibre tensile failure in FRP
The compact tension specimen was used to measure the fracture toughness of the fibre tensile failure mode, in UD plies. An optimal data reduction scheme was identified and used to investigate specimen geometrical and lay-up effects. It was demonstrated that is not simply a material property, but dependent upon specimen lay-up.
McCarroll CA, Robinson P, Pinho ST, et al., 2009, High rate fractue toughness test design for tensile fibre failure modes
The compact tension specimen has been investigated numerically for the measurement of Mode I fracture toughness associated with fibre tensile failure,GIc, at crack speeds of the order of 200 m/s. This paper develops a load-independent data reduction scheme for analysing such tests using the compressive strain measured at the back edge of the specimen.
Escárpita A, Elizalde H, Ramírez RA, et al., 2009, Modified cruciform specimen for biaxial testing of fibre-reinforced composites
This work introduces an enhanced cruciform specimen optimized for the mechanical characterization of fibre-reinforced composite materials subjected to a biaxial stress state (e.g. orthogonal loads). The tension-tension case, for which there is scarce published data, is specifically analyzed. First, different cruciform specimens reported in literature are modelled via finite elements to determine their stress distribution. Based on these results, as well as in existing standards and guidelines for uniaxial mechanical testing in metals and composites, an enhanced design is developed, aimed to ensure that the deformation field in its central region remains truly biaxial, thus increasing the reliability of yielded data. Future work will cover an extensive experimental program to validate this design, although early results using full-deformation strain field measurements are encouraging.
Pinho ST, Robinson P, Schuecker C, et al., 2009, Pressure-dependent constitutive and failure model for laminated composites
This paper presents a non-linear, pressure-dependent, three dimensional constitutive law and associated failure criteria for laminated composites with UD plies. The failure criteria result from a physical model for each failure mode. In-situ strengths are used for matrix failure and fibre kinking. The model is validated against experimental data.
Gutkin R, Pinho ST, Robinson P, et al., 2009, Investigation of kink-band formation under biaxial stress state
This paper investigates longitudinal compressive failure. Two failure modes were observed experimentally for pure longitudinal compression: shear-driven fibre compressive failure and kink-band formation. In a micromechanical numerical study, failure envelopes for combined longitudinal compression and in-plane shear were predicted.
Gill AF, Robinson P, Pinho S, 2009, Effect of variation in fibre volume fraction on modes I and II delamination behaviour of 5HS woven composites manufactured by RTM, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 69, Pages: 2368-2375, ISSN: 0266-3538
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- Citations: 46
Pimenta S, Pinho ST, Robinson P, 2009, Experimental study on the mechanical performance of recycled CFRP, 17th International Conference on Composite Materials
The mechanical behaviour of a recycled CFRP (rCFRP), with fibres reclaimed by pyrolysis and manufactured via resin infusion of recycled-fibre mats, is studied. The mechanical properties are characterised, demonstrating that rCFRP can replace GFRP. The rCFRP failure modes in tension and compression are also investigated, at the microscopic scale.
Pimenta S, Gutkin R, Pinho ST, et al., 2009, A micromechanical model for kink-band formation: Part II-Analytical modelling, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 69, Pages: 956-964, ISSN: 0266-3538
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- Citations: 73
Pinho ST, Robinson P, Iannucci L, 2009, Developing a four point bend specimen to measure the mode I intralaminar fracture toughness of unidirectional laminated composites, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 69, Pages: 1303-1309, ISSN: 0266-3538
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- Citations: 49
Pimenta S, Gutkin R, Pinho ST, et al., 2009, A micromechanical model for kink-band formation: Part I - Experimental study and numerical modelling, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 69, Pages: 948-955, ISSN: 0266-3538
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- Citations: 121
Carvalho NV, Pinho ST, Robinson P, 2009, Compressive failure of 2D woven composites
This paper presents experimental and numerical research on the compressive failure of orthogonal 2-D woven composites with different stacking emphasizing the role of the interlacing region of tows. Resulting optical micrographs demonstrate the influence of the support of adjacent layers on the sequence of events leading to failure of woven composites.
McCarroll CA, Robinson P, Pinho ST, et al., 2009, High rate fractue toughness test design for tensile fibre failure modes
The compact tension specimen has been investigated numerically for the measurement of Mode I fracture toughness associated with fibre tensile failure,GIc, at crack speeds of the order of 200 m/s. This paper develops a load-independent data reduction scheme for analysing such tests using the compressive strain measured at the back edge of the specimen.
Gutkin R, Pinho ST, Robinson P, et al., 2009, Investigation of kink-band formation under biaxial stress state
This paper investigates longitudinal compressive failure. Two failure modes were observed experimentally for pure longitudinal compression: shear-driven fibre compressive failure and kink-band formation. In a micromechanical numerical study, failure envelopes for combined longitudinal compression and in-plane shear were predicted.
Pimenta S, Pinho ST, Robinson P, 2009, Experimental study on the mechanical performance of recycled CFRP
The mechanical behaviour of a recycled CFRP (rCFRP), with fibres reclaimed by pyrolysis and manufactured via resin infusion of recycled-fibre mats, is studied. The mechanical properties are characterised, demonstrating that rCFRP can replace GFRP. The rCFRP failure modes in tension and compression are also investigated, at the microcopic scale.
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